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(No Model.)

B. R. KNOWLES 8: 1-. E. IDELL.

DYNAMO ELECTRIC MACHINE. No. 292,121. C Patented Jan. 15, 1884.

N. PETERS, PhoXO-Lilhugmphcn Washington. D. C.

UNITED STATES PATENT OrFIcE,

EDWARD R. KN OYV LES, OF BROOKLYN, NE\V YORK, AND FRANK E. IDELL, OF HOBOKEN, NEW JERSEY, ASSIGNORS TO THE CONSOLIDATED ELEG- TBIO LIGHT COMPANY, OF NEW YORK.

DYNAMO-ELECTRlC MACHINE SPECIFICATION forming part of Letters Patent No. 292,121, dated January 15, 1884. Application filed September 6, 1852. (No model.)

To aZZ whom, it may concern: on it. Between the nut K and the insulating Be it known that we, ED\VARD R. KNOWLES ring G is a loose metal ring, M, to which the 5 and FRANK E. IDELL, citizens of the United conductor is attached. Around the brush- States, residing, respectively, in Brooklyn, in arm A is coiled the springB, one end of which 5 the county of Kings and State of New York, is fastened to A at O, and the other end to F and Hoboken, in the county of Hudson and at D, Figs. 1 and 2. The brush L is retained State of New Jersey, have invented certain in the arm A by the screws X X, or in any new and useful Improvements in Dynamoother suitable manner.

Electric Machines, of which the following is The operation of the mechanism is as fol- 10 a description in such full, clear, concise, and lows: After the brushes L are adjusted to exact terms as will enable any one skilled in proper lengths and securely fastened in the the art to which our invention appertains to arms A by means of the screws X, they are make and use the same, reference being had made to press against the commutator-cylinto the accompanying drawings, making part der S by turning the sleeve F by the arms E I 5 of this specification, and to the letters and until the proper pressure of the brush against figures of reference marked thereon. the commutator-cylinder is obtained by un- Our invention relates to that part of a dycoiling the springs B against themselves. namo-electric machine known as the com- Vhen this is accomplished, the nut K is mutator-brush holders, and it consists in so screwed up tight against M, thus binding the 2o constructing and arranging the parts thereof sleeve F and ring M against the insulatingthat the brushes are applied to the commutaring G, and retaining the sleeve F in the detor with a constant and even pressure, readily sired position. The arm A is, however, free 6- adjustable to any degree; and, further, so that to rotate, and the spring B will keep the brush the brushes can be advanced when worn away constantly pressed against the commutator S. 2 5 at their ends. We do not claim the use of a spring brush- In the drawings, Figure 1 is a side view, arm, broadly, as we are aware that there are partly in section, of a brush-arm and yoke other spring brush-arms in use which are inconstructed according to our invention. Fig. tended to accomplish similar results to those 2 shows the spring and pin connection, the secured by ours; but

30 adjustable spring-sleeve, and the means for \Vhat we do claim, and desire to secure by fastening the brush into the brush-arm. Letters Patent, is

H is a yoke passing around the bearing of In a dynamo-electric machine, the combinathe machine, about which it can be rotated, tion, with the brushes and commutator, of an and to which it can be clamped in any desired arm, A, a spring, B, an adjusting-sleeve, F,

35 position. The hole through the end of H is acontact-ring, M, and a tightening-nut, K, bushed with the insulating-ring G. Through the whole being supported upon a yoke, H, Gis passed the metal sleeve F, provided with substantially as described, for the purpose the projectingpins or handles E E. Through specified.

the sleeve F is passed the end of the brush EDW'ARD It. KNOWLES. 4o arm A, and which is secured in F by the FRANK E. TDELL.

groove I and pin J, or in any suitable manner. Vitnesses:

The end of the sleeve F is screw-threaded, as WM. H. BROADNAX,

shown, Fig. 1, and a hollow nut, K, is screwed J. EDGAR BULL. 

